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A thin film of refractive index 1.35 overlays a substrate of refractive index 1.67. The entire...

A thin film of refractive index 1.35 overlays a substrate of refractive index 1.67. The entire apparatus is placed in air. If the film is illumninated with light of wavelength 766 nm, determine the minimum thickness required to observe a dark surface film. Please include a sketch or diagram of the setup, including reflected phase changes.

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